Improvement in edging-machines



U. H. GRUNBEBG 8!. W. M. FEBBYI Edging-Machines. I N0. 139,142. Patented May 20.1873.

. AM PHam uruosRAPn/c on My (ossonwsls mac ss) UNITED STATES PATENTOFrIoE.

OTTO H. GRONBERG, OF FERRYSBURG, AND WILLIAM M. FERRY, OF GRAND HAVEN,MICHIGAN.

IMPROVEMENT IN EDGlNG-MACHINES.

Specification forming part of Letters Patent No. 139,142, dated May 20,1873; application filed April 8, 1873.

To all whom it may concern:

Be it known that we, OTTo H. GRONBERG, of Ferrysburg, and WILLIAM M.FERRY, of Grand Haven, in the county of Ottawa and State of Michigan,have invented a new and useful Improvement in Edging-Machines; and we dodeclare that the following is a true and accurate description thereof,reference being had to the accompanying drawing and to the letters ofreference marked thereon and being a part of this specification, inwhich- Figure 1 is a perspective view. Fig. 2 is a sectional plan,showing the lazy-ton gs and their connections. Fig. 3 is a longitudinalvertical section taken on the line a w in Fig. 1.

Like letters refer to like parts in the several figures.

The nature of this invention relates to an improvement in that class ofmachines for edging and ripping lumber wherein two or more saws areemployed on a mandrel, the said saws having a longitudinal adjustment onthe mandrel for ripping the boards in parallel lines; and our object isto so construct the machine that the sawyer can, in once passing a boardthrough it, take out the narrow strip of heart, which is usuallydecayed, and edge both strips, so that the latter will inspect as clearor upper quality of lumber; or, if he so prefer while edging a board, hecan ripit into strips of uniform width by a single movement of the adjusting-lever. The invention consists in one or two gangs of circularsaws, whose collars" are feathered on a mandrel, each gang beingadjusted by a lever,

. or its equivalent, through a system of crossed levers or lazy-tongs,whose center pivots are short standards which embrace the collars of theseveral saws; also, in the arrangement of the notched quadrants, as morefully hereinafter set forth.

In the drawing, A represents the frame of our machine, and B asaw-mandrel trans versely journaled therein near the rear end, directlyunder which two slide-bars, C G, are bolted across and between the sidesof the frame. D D are crossed levers, the former lying on the slidebarsand the latter underneath them, pivoted together at their ends and attheir intersections, forming what is known as the lazy-tongs. In thedouble-gang edger shown in the accompanying drawing there are two ofthese lazy-tongs, one for each gang of saws, the outer pivot of eachbeing rigidly secured at the proper point between the slide-bars. Theintersecting pivots of the crossed levers are short standards, E,projecting upward, and on the top of each is sleeved a yoke, a, whichembraces a groove in the collar b of each saw F. The central pivot ofthe inner end of each lazy-ton gs is extended downward to form a pendentstud, which is received in a slot at the end of a lever, G, pivoted at cto a post rising from the floor, or from a girt in the frame, while theouter end of said lever rests on a quadrant, H, at the end of the frame.The movement of the lever in one direction expands or dilates thelazy-tongsand a reverse movement contracts it. The saws move with thecenter-pivots of the crossed levers, the saw over the moving end of thelazy-tongs moving twice as fast and as far as the next one to it, sothat there will always be the same distance between the saws as there isbetween the outer saw and the gage or guide at the N side of the frame;it follows, then, that a board to be edged by the inner saw will alwaysbe ripped into strips of equal widths at the single passage through themachine. In the machine shown there are two gangs of saws, one at eachend of the mandrel, each moved by its own lever, in such a manner thatall the saws of both gangs, except the inner or last one, may becollected in a group at either end of the mandrel, when a board at thatside of the machine may be ripped into strips of uniform width or theboard may be edged and one or more strips be taken from one or bothsides. It will be noticed that one gang has three saws, the two innerones being mounted on one collar, four inches apart; this is done forthe purpose of enabling the sawyer to rip out the heart or a defectivestreak in any part of the board, which is thus converted into clearstrips or upper quality of lumber, having a much higher market valuethan if the defective streak were left in, which would cause the boardto be imperfect, as of low grade. A saw maybe keyed or secured in astationary position near one end of the mandrel for edging one side ofthe board, where the machine has but one gang of saws; in the doublegang, all the saws are movable on their mandrel. Each lever rests uponits own quadrant at the head of the machine, the upper quadrant bein gbolted to the inner faces of the legs, and the lower one to their outerfaces, so as to bring the notches and figures on its top in full view ofthe sawyer; both quadrants have notches e on their upper faces, sospaced as to indicate each two inches of lateral movement of the saws.On the under face of each lever is a rib, which drops into any notch onits quadrant, and thus locks the saws in their position.

The top of the upper quadrantis figured at each notch, from 4 to 18, byintervals of two inches, reading from left to right; on the face orfront of this quadrant the figures 12 are placed under 4: of the toprow, 8 under 6, and 4 under 8 of the top row. The lower quadrant isnotched and figured in like manner, reading from right to left, both onthe top and front sides, as above described; the figures on the tops ofthe quadrants indicate the spaces between the saws of a gang, whileadding the figures together on the faces, between the two notches inwhich the levers may be engaged, gives the distance between the innersaw of one gang and that of the other. One of the advantages of thismachine lies in the fact that the saws do not have to be removed forfiling, as they may be spaced apart on the mandrel far enough to allowthe sawyer to use his file between them in filing. If preferred, theslide-bars may be notched instead of the quadrants, to lock the leversin adjusting the saws.

What we claim as our invention, and desire to secure by Letters Patent,is-- 1. In gang edging and ripping machines, the combination oflazy-tongs with the sawcollars for adjusting the saws on their mandrel,substantially as herein shown and set forth.

2. The combination of the movable saws F F, the lazy-tongs D D, thelevers G G, and the quadrants H H, arranged as described, for thepurpose set forth.

OTTO H. GRONBERG. WILLIAM M. FERRY.

Witnesses:

HUGH DONAHUE, H.- BLOEGKER.

